Patterns of landscape evolution on the central and northern Tibetan Plateau investigated using in-situ produced Be-10 concentrations from river Sediments
2014 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 398, 77-89 p.Article in journal (Refereed) Published
Quantifying long-term erosion rates across the Tibetan Plateau and its bordering mountains is of critical importance to an understanding of the interaction between climate, tectonic movement, and landscape evolution. We present a new dataset of basin-wide erosion rates from the central and northern Tibetan Plateau derived using in-situ produced Be-10 concentrations of river sediments. Basin-wide erosion rates from the central plateau range from 10.1 +/- 0.9 to 36.8 +/- 3.2 mm/kyr, slightly higher than published local erosion rates measured from bedrock surfaces. These values indicate that long-term downwearing of plateau surfaces proceeds at low rates and that the landscape is demonstrably stable in the central plateau. In contrast, basin-wide erosion rates from the Kunlun Shan on the northern Tibetan Plateau range from 19.9 +/- 1.7 to 163.2 +/- 15.9 mm/kyr. Although the erosion rates of many of these basins are much higher than the rates from the central plateau, they are lower than published basin-wide erosion rates from other mountains fringing the Tibetan Plateau, probably because the basins in the Kunlun Shan include both areas of low-relief plateau surface and high-relief mountain catchments and may also result from retarded fluvial sediment transport in an arid climate. Significantly higher basin-wide erosion rates derived from the Tibetan Plateau margin, compared to the central plateau, reflect a relatively stable plateau surface that is being dissected at its margins by active fluvial erosion.
Place, publisher, year, edition, pages
2014. Vol. 398, 77-89 p.
cosmogenic nuclides, basin-wide erosion rates, Tibetan Plateau, Kunlun Shan, landscape evolution
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-106315DOI: 10.1016/j.epsl.2014.04.045ISI: 000337870400008OAI: oai:DiVA.org:su-106315DiVA: diva2:736193